Question: Which Class IC flammable liquid has the most no-observed-adverse-effect level?
Paraphrase: What Class IC liquid that is flammable has the highest level of 'no observed adverse effect'?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q21009056 . ?ent wdt:P2717 ?obj } ORDER BY DESC(?obj)LIMIT 5 
Answer: chlorobenzene